Find the cost of fencing a rectangular park 300 m long and 200 m wide at the rate of ₹4 per metre.

Length of the park = 300 m
Breadth = 200 m
∴ Perimeter of the park = 2 [length + breadth]
= 2 [300 m + 200 m]
= 2 × 500 m = 1000 m.
Cost of fencing the rectangular park = 1000 × 4 = ₹ 4000